What was something bad a friend did to you when you were 13 (or older if it applies)?

I had a friend who wasn't really a friend at all. As it turned out she used me. A lot. She would lie to her mom and say she was with me and then get mad if I didn't want to stick up for her and go along with it. It finally erupted when we were supposed to be football sisters and purchase things for the players. She told me to buy the stuff and she would pay me. I never saw the $$$. I called her mom and she said I gave her the $$ to give to you and I told her I never got it. The girl showed up at my house and when I answered the door she punched me in the face and ran. What an idiot! She ended up in the Juvenile Detention Center.